Add option to make terminal buffers unlisted

[BlueDrink9]

Currently, if I switch to the next tab, I might end up with this plugin's terminal buffer full-window instead of the desired buffer.

This would be solved by calling setlocal nobuflisted when starting the vim-terminal-help terminal.

Would you be willing to create such an option?

[swtch1]

Isn't this what g.terminal_list = 0 does? vim.g.terminal_list = 0 in lua.